Which type of hair color is known for its ability to lighten and add color simultaneously?

Bleach is specifically designed to lighten hair by removing its natural pigment, which can create a lighter base before applying a new color. Additionally, it can also be used to deposit new color simultaneously. This dual action is crucial in hair coloring techniques that aim to achieve a specific shade while lifting the original color.

In contrast, permanent and demi-permanent colors typically focus on depositing color without significant lightening effects, while semi-permanent colors mainly deposit color without the capability to lighten the hair. Therefore, bleach stands out for its unique ability to lighten hair while also allowing for color application.